Reliability of Transabdominal Ultrasound in the Measurement of Prostate Size


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Thirty‐eight patients underwent transabdominal sonographic measurement of their prostate by two different sonographers. Prostatic weight was estimated by the ellipsoid method. In 47% of the cases the second estimate of weight was within 5g of the first and in 84% of cases the second estimate was within 1% of the first. 95% of the time the second estimate was within 16g of the first. The differences in estimated weight between the two observers ranged from lg to 22g with a mean of 6g. The estimated prostatic weight differed from the mean prostatic weight by more than 20% in 58% of cases. (Mean prostatic weight = the mean of the two weights estimated for each patient). Measurement error was less significant in the larger prostates. The accuracy is probably satisfactory in routine clinical practice when the aim is to demonstrate the presence and degree of prostatic enlargement but the error may be significant in pre‐operative assessment of prostate size and measurement prior to stenting the prostatic urethra. The error, if not accounted for, could compromise a clinical trial involving serial prostatic measurements.

Original languageEnglish (US)
Pages (from-to)358-360
Number of pages3
JournalAustralasian Radiology
Issue number4
StatePublished - Nov 1991


  • Measurement Prostate Size
  • Reliability
  • Transabdominal Ultrasound

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging


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